A Grafton man believed to be the masked robber who held up an attendant at the A.L. Prime Gas Station in Northbridge was arrested by Northbridge Police Sunday.

Christopher Keating, 32, of 1 Railroad Court #2, Grafton, was charged with armed robbery while masked and operating a motor vehicle with a suspended license.

On Tuesday, March 19, the attendant at the gas station told police he was robbed at knife point by a masked individual. Officers searched the area and were unable to locate the suspect.

Keating was held overnight on $20,000 cash bail.